The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you.

This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crash...



As promised, Phil's sun spotting recommendations:

Astronomers Without Borders (charitable org): http://store.astronomerswithoutborder...

Rainbow Symphony glasses: http://www.rainbowsymphony.com/solecl...

Wide variety of viewers from Rainbow Symphony: http://www.eclipseglasses2017.com/buy...


Chapters:
Introduction 00:00
How Do Solar Eclipses Work? 0:52
Umbra & Penumbra 2:04
The Sun's Corona 3:17
Solar Eclipse Totality 4:14
Annular Eclipse 5:09
Can You Look at a Solar Eclipse? 5:32
Lunar Eclipses 6:54
Size of the Earth and Moon 8:24
Review 9:27


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PHOTOS/VIDEOS
http://svs.gsfc.nasa.gov/cgibin/deta...
http://www.nasa.gov/audience/forstude...
http://en.wikipedia.org/wiki/Eclipse#...
http://en.wikipedia.org/wiki/Solar_ec...
http://commons.wikimedia.org/wiki/Fil...
http://en.wikipedia.org/wiki/Solar_ec...
http://philhart.smugmug.com/Sun/Queen...
http://svs.gsfc.nasa.gov/cgibin/deta...
http://philhart.smugmug.com/Sun/Queen...
http://philhart.smugmug.com/Sun/Queen...
   • ScienceCasts: Solar Eclipse in the USA  
http://en.wikipedia.org/wiki/Solar_ec...
http://commons.wikimedia.org/wiki/Fil...
http://svs.gsfc.nasa.gov/cgibin/deta...
http://en.wikipedia.org/wiki/File:Lun...
http://svs.gsfc.nasa.gov/cgibin/deta...
http://en.wikipedia.org/wiki/Lunar_ec...
http://svs.gsfc.nasa.gov/cgibin/deta...